pyqt/basic/layout_10.py

import sys

from PyQt5.QtWidgets import (
    QMainWindow, QFormLayout,
    QLineEdit, QSpinBox,
    QComboBox, QWidget,
    QApplication, QLabel,
    QAction, QToolBar,
    QStatusBar,
)


class MyWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle('My App')

        layout = QFormLayout()

        # Dictionary to store the form data
        self.data = {
            "name": "Johnina Smith",
            "age": 10,
            "icecream": "Vanilla",
        }

        self.name = QLineEdit()
        self.name.setText(self.data["name"])
        self.name.textChanged.connect(self.handle_name_changed)
        self.age = QSpinBox()
        self.age.setRange(0, 200)
        self.age.setValue(self.data["age"])
        self.age.valueChanged.connect(self.handle_age_changed)
        self.icecream = QComboBox()
        self.icecream.addItems(["Vanilla", "Strawberry", "Chocolate"])
        self.icecream.setCurrentText(self.data["icecream"])
        self.icecream.currentTextChanged.connect(self.handle_icecream_changed)

        layout.addRow("Name", self.name)
        layout.addRow("Age", self.age)
        layout.addRow("Favorite icecream", self.icecream)
        # Empty label to show error message
        self.error = QLabel()
        layout.addWidget(self.error)

        toolbar = QToolBar("My main toolbar")

        widget = QWidget()
        widget.setLayout(layout)
        self.setCentralWidget(widget)
        toolbar.toggleViewAction().setEnabled(False)
        self.addToolBar(toolbar)

        button_action = QAction("Your button", self)
        button_action.setStatusTip("This is your button")
        button_action.triggered.connect(self.onMyToolBarButtonClick)
        button_action.setCheckable(True)
        toolbar.addAction(button_action)

        self.setStatusBar(QStatusBar(self))

    def handle_name_changed(self, name):
        self.data["name"] = name
        print(self.data)
        self.validate()

    def handle_age_changed(self, age):
        self.data["age"] = age
        print(self.data)
        self.validate()

    def handle_icecream_changed(self, icecream):
        self.data["icecream"] = icecream
        print(self.data)
        self.validate()

    def validate(self):
        if self.data["age"] > 10 and self.data["icecream"] == "Chocolate":
            self.error.setText("People over 10 aren't allowed chocolate ice cream")
            return
        if self.data["age"] > 100:
            self.error.setText("Did you send a telegram?")
            return
        self.error.setText("")

    def onMyToolBarButtonClick(self, is_checked):
        print("click", is_checked)


app = QApplication(sys.argv)
window = MyWindow()
window.show()
sys.exit(app.exec_())